docs: def __gzip(filename):
  		""" Compress a file returning the new filename (.gz)
  		"""
  		zipname = filename + '.gz'
  		file_pointer = open(filename,'rb')
  		zip_pointer = gzip.open(zipname,'wb')
  		zip_pointer.writelines(file_pointer)
  		file_pointer.close()
  		zip_pointer.close()
  		return zipname